Thermostat switching circuitry robust against anomalous HVAC control line conditions
First Claim
1. A thermostat comprising:
- a plurality of HVAC wire connectors configured to receive a plurality of HVAC wires from an HVAC system, the plurality of HVAC wire connectors comprising at least one call relay wire connector and at least one power return wire connector;
one or more solid-state switching elements coupled to the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements having a first operating state in which the one or more solid-state switching elements create a connection between the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements also having a second operating state in which said connection between the at least one call relay wire connector and the at least one power return wire connector is interrupted;
power monitoring circuitry coupled to the one or more solid-state switching elements that measures voltage and/or current characteristics of the one or more solid-state switching elements during times when the one or more solid-state switching elements are operating in the first operating state;
processing and control circuitry coupled to the power monitoring circuitry and configured to control at least one HVAC function associated with the at least one call relay wire connector, wherein the processing and control circuitry is further configured to;
cause the one or more solid-state switching elements to operate in the first operating state to actuate the at least one HVAC function;
during times when the at least one HVAC function is actuated, detect an anomaly associated with the voltage and/or current measurements from the power monitoring circuitry;
in response to detecting the anomaly, cause the one or more solid-state switching elements to operate in the second operating state for at least a first time interval;
after the expiration of the first time interval, cause the one or more solid-state switching elements to operate in the first operating state and determine whether the anomaly is still present.
2 Assignments
0 Petitions
Accused Products
Abstract
A thermostat may include HVAC wire connectors that receive a call relay wire and a power return wire, switching elements having a first operating state in which they create a connection between the call relay wire and the power return wire and a second operating state in which the connection between the call relay wire and the power return wire is interrupted. The thermostat may also include control circuitry configured to cause the switching elements to operate in the first operating state to actuate an HVAC function; detect an anomaly associated with measurements from power monitoring circuitry; cause the switching elements to operate in the second operating state for at least a first time interval; and after the expiration of the first time interval, cause the one or more switching elements to operate in the first operating state and determine whether the anomaly is still present.
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Citations
20 Claims
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1. A thermostat comprising:
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a plurality of HVAC wire connectors configured to receive a plurality of HVAC wires from an HVAC system, the plurality of HVAC wire connectors comprising at least one call relay wire connector and at least one power return wire connector; one or more solid-state switching elements coupled to the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements having a first operating state in which the one or more solid-state switching elements create a connection between the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements also having a second operating state in which said connection between the at least one call relay wire connector and the at least one power return wire connector is interrupted; power monitoring circuitry coupled to the one or more solid-state switching elements that measures voltage and/or current characteristics of the one or more solid-state switching elements during times when the one or more solid-state switching elements are operating in the first operating state; processing and control circuitry coupled to the power monitoring circuitry and configured to control at least one HVAC function associated with the at least one call relay wire connector, wherein the processing and control circuitry is further configured to; cause the one or more solid-state switching elements to operate in the first operating state to actuate the at least one HVAC function; during times when the at least one HVAC function is actuated, detect an anomaly associated with the voltage and/or current measurements from the power monitoring circuitry; in response to detecting the anomaly, cause the one or more solid-state switching elements to operate in the second operating state for at least a first time interval; after the expiration of the first time interval, cause the one or more solid-state switching elements to operate in the first operating state and determine whether the anomaly is still present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of actuating HVAC functions using a thermostat while providing electrical isolation from electrical anomalies, the method comprising:
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providing a plurality of HVAC wire connectors configured to receive a plurality of HVAC wires from an HVAC system, the plurality of HVAC wire connectors comprising at least one call relay wire connector and at least one power return wire connector; providing one or more solid-state switching elements coupled to the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements having a first operating state in which the one or more solid-state switching elements create a connection between the at least one call relay wire connector and the at least one power return wire connector, the one or more solid-state switching elements also having a second operating state in which said connection between the at least one call relay wire connector and the at least one power return wire connector is interrupted; measuring voltage and/or current characteristics of the one or more solid-state switching elements during times when the one or more solid-state switching elements are operating in the first operating state using power monitoring circuitry coupled to the one or more solid-state switching elements; controlling at least one HVAC function associated with the at least one call relay wire connector using processing and control circuitry coupled to the power monitoring circuitry; causing the one or more solid-state switching elements to operate in the first operating state to actuate the at least one HVAC function; during times when the at least one HVAC function is actuated, detecting an anomaly associated with the voltage and/or current measurements from the power monitoring circuitry; in response to detecting the anomaly, causing the one or more solid-state switching elements to operate in the second operating state for at least a first time interval; after the expiration of the first time interval, causing the one or more solid-state switching elements to operate in the first operating state and determine whether the anomaly is still present. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification